Sonic.net

I'm setting up a group mailing list. I intended the list to be one that allows me to send a daily message to group members. Now I find that members of the list are posting to everyone else and it is creating mass confusion.

Does anyone know how I can change the settings so only I as the administrator can send messages?

Yes, in the list's settings, in Member Tools. Turn off reply to list, which will mean replies will go to sender instead, and turn on moderation.